Free ISO metric fastener blocks for AutoCAD (DWG): hex bolts, socket head screws, nuts, washers

About the ISO standards and the dimensions

The dimensions come from the tables of ISO 4017, ISO 4762, ISO 4032 and ISO 7089 and were checked against published tables. Where ISO and DIN differ we use ISO: for M10 and M12 the width across flats is 16 and 18 mm, not the 17 and 19 mm of DIN.

The blocks are our own drawings, not copies of the standards, and the library is not certified. The dimensions are nominal drawing dimensions without tolerances. Check them against the edition of the standard your client requires, since values can differ between editions and national versions.

Frequently asked questions

Are these fasteners to ISO dimensions?

Yes. The dimensions of each block come from the tables of the standard named in its group. They are nominal drawing dimensions, without tolerances.

Why is the wrench size of M10 and M12 16 and 18 mm?

Those are the ISO values. Many suppliers still sell M10 and M12 bolts and nuts with the older DIN sizes, 17 and 19 mm, so check the head size of the part you actually buy.

Can I use the symbols in commercial projects?

Yes. They are free to use and modify in your own projects, including commercial ones. They are provided as is, without warranty.

How do I count the fasteners in my drawings?

Export the fastener blocks of all drawings to Excel with BlockSync: one row per block with its DESIGNATION, standard, property class and quantity. Total them with a pivot table to get a fastener list.

Can I change a symbol or add attributes?

Yes. Open the DWG, edit a block with BEDIT to change it or add attributes, and save. To update drawings that already contain the block, run ATTSYNC or replace the block. Make a backup first: attribute values can be lost if ATTSYNC is used carelessly.

Where do I find a ready-made set of these symbols for AutoCAD?

AutoCAD itself ships only a small set of sample blocks, so a full symbol set has to come from a library. Download the ZIP on this page and open the DWG: every symbol is a block. Insert one with INSERT (Blocks palette, Libraries tab, then pick the DWG) or drag it from DesignCenter (ADCENTER). You can also download a single symbol on its own.